@BigJoeBastardi tweet storm from a short while ago:
"10 days of wild wintery weather shaping up from Portland Ore to Portland Maine south to around I70.Backs off next 10, but back Feb 1 on."
"strat warm blooms Dec 15-Jan 5, sets up cold coming, but backed away ( so US warms Jan 20-30) new one starting now!"
http://pic.twitter.com/8NRpCl8t "Did post on WxBell on this. Center or warming over the pole or into Greenland leads to coldest US temps 2-3 weeks later."
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"Models will miss low level cold air that shows up. MSP for instance with forecasted Tue pm temps near 20 will bust by at least 10."
"I have seen this dozens of time as the stability of true arctic air is not handled by models. Watch the example in the n plains Tue."
"That being said, the in and out in the US is nothing compared to what may be a legendary cold period for western Canada. Alaskan cold on way."